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Ultrafast laser-induced control of magnetic materials
Opršal, Jakub ; Wojewoda, Ondřej (referee) ; Arregi Uribeetxebarria, Jon Ander (advisor)
Magnetické materiály jsou ve velkém používány pro ukládání dat, která jsou zapisována ve formě bitů pomocí externího magnetického pole. Dlouho se věřilo, že doba potřebná pro změnu magnetizace je v řádu desítek až stovek pikosekund. Revoluční experiment v roce 1996 položil základ pro nový obor ultrarychlého ovládání magnetických materiálů, řádově zkracující čas potřebný pro změnu magnetizace. Mimo jiné ukázal, že magnetizace materiálu může být ovlivněna i světelnými pulzy. V této práci jsme replikovali fundamentální, laserem indukované experimenty ve ferromagnetických a ferrimagnetických materiálech. Postavili jsme optickou sestavu schopnou provádět tyto experimenty pro různé polarizace světla. Tato variabilita umožňuje rozlišit různé mechanismy a jevy, které se vyskytují při ultrarychlém ovládání magnetizace magnetických materiálů.
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Binocular vision
Brichta, Tomáš ; Jehlička, Karel (referee) ; Fedra, Petr (advisor)
In this work I have been briefed by physiology of binocular vision for acquisition of three-dimensional perception from two-dimensional images using special glasses. At first I described optical organ, after it I described physiology of binocular vision. In the next part of my work I described stereoscopic imaging technology and their advantages and disadvantages. In the next part of this work I have designed method for measuring ideal distance between cameras for scanning and projection of stereoscopic image using program Inition StereoBrain Calculator. After scenes design I have collected visual data for creating 3D videos. This videos were been projected to the group of the viewers. Data from the viewers were been analyzed afterwards.
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The Optical Link Error-Rate Determination
Joch, Antonín ; Kapoun, Vladimír (referee) ; Kyselák, Martin (advisor)
The master thesis discusses physical causes of light polarization and problems brought by nascence of Polarization Mode Dispersion (PMD). These problems occur especially by high speed systems on optical cable traces. The thesis deals with actuation of transmitted signal by influence of Inter Symbol Interference and it also deals with methods for its measuring and compensation. As a results of measurements are in text presented data provided by EXFO Electro-Optical Engineering Inc. Company. Significant part of the thesis focuses on optical link Bit Error Rate (BER) which is connected with Signal to Noise Ratio (SNR) and signal quality (Q-factor). Further on it is possible to find in text about so called eye diagram which is display mode that shows influence of communication channel on shape of the transmitted signal. To this diagram is related another one called constellation diagram which describes modulation mode and makes it possible to map dispersion of signal points around their nominal values. In connection with so called trajectory it makes vector diagram. Practical part includes depiction of these diagrams in MATLAB development environment.
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Ultrafast laser-induced control of magnetic materials
Opršal, Jakub ; Wojewoda, Ondřej (referee) ; Arregi Uribeetxebarria, Jon Ander (advisor)
Magnetické materiály jsou ve velkém používány pro ukládání dat, která jsou zapisována ve formě bitů pomocí externího magnetického pole. Dlouho se věřilo, že doba potřebná pro změnu magnetizace je v řádu desítek až stovek pikosekund. Revoluční experiment v roce 1996 položil základ pro nový obor ultrarychlého ovládání magnetických materiálů, řádově zkracující čas potřebný pro změnu magnetizace. Mimo jiné ukázal, že magnetizace materiálu může být ovlivněna i světelnými pulzy. V této práci jsme replikovali fundamentální, laserem indukované experimenty ve ferromagnetických a ferrimagnetických materiálech. Postavili jsme optickou sestavu schopnou provádět tyto experimenty pro různé polarizace světla. Tato variabilita umožňuje rozlišit různé mechanismy a jevy, které se vyskytují při ultrarychlém ovládání magnetizace magnetických materiálů.
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Binocular vision
Brichta, Tomáš ; Jehlička, Karel (referee) ; Fedra, Petr (advisor)
In this work I have been briefed by physiology of binocular vision for acquisition of three-dimensional perception from two-dimensional images using special glasses. At first I described optical organ, after it I described physiology of binocular vision. In the next part of my work I described stereoscopic imaging technology and their advantages and disadvantages. In the next part of this work I have designed method for measuring ideal distance between cameras for scanning and projection of stereoscopic image using program Inition StereoBrain Calculator. After scenes design I have collected visual data for creating 3D videos. This videos were been projected to the group of the viewers. Data from the viewers were been analyzed afterwards.
|
|
|
The Optical Link Error-Rate Determination
Joch, Antonín ; Kapoun, Vladimír (referee) ; Kyselák, Martin (advisor)
The master thesis discusses physical causes of light polarization and problems brought by nascence of Polarization Mode Dispersion (PMD). These problems occur especially by high speed systems on optical cable traces. The thesis deals with actuation of transmitted signal by influence of Inter Symbol Interference and it also deals with methods for its measuring and compensation. As a results of measurements are in text presented data provided by EXFO Electro-Optical Engineering Inc. Company. Significant part of the thesis focuses on optical link Bit Error Rate (BER) which is connected with Signal to Noise Ratio (SNR) and signal quality (Q-factor). Further on it is possible to find in text about so called eye diagram which is display mode that shows influence of communication channel on shape of the transmitted signal. To this diagram is related another one called constellation diagram which describes modulation mode and makes it possible to map dispersion of signal points around their nominal values. In connection with so called trajectory it makes vector diagram. Practical part includes depiction of these diagrams in MATLAB development environment.
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